Fireless Locomotives - Llandarcy, Wales. Oil storage depots and oil handling docks used 'fireless' locomotives (steam was pumped in to a specially constructed usually dome-ended 'boiler' and the loco used this to drive conventional pistons). These engines had no fire so no coal bunker or funnel and the pistons were often mounted at the cab end of the chassis. The first UK oil refinery to process imported crude oil was at Llandarcy near Swansea. The site was chosen for a refinery due to close proximity to Swansea docks, where the crude arrived by sea from the Middle East.